Hardie board, a popular siding choice, often raises concerns about its fire resistance. This guide delves into the fire ratings of James Hardie's cement fiber board, providing a comprehensive understanding to help you make informed decisions for your home's safety and aesthetics.
James Hardie's hardie board is designed with a proprietary formulation that includes cement, wood fiber, and sand, resulting in a product that offers superior durability and resistance to fire, insects, and rot compared to traditional vinyl or wood siding.
Understanding Fire Ratings
Fire resistance is measured using ASTM E136 or ASTM E648 standards, which define the fire rating based on how materials behave when exposed to high heat and flame:
- Noncombustible: Does not ignite or contribute fuel to a fire (Fire Resistance = 0).
- Combustible: Naturally ignites and feeds a fire (Fire Resistance = < 30).
James Hardie Board Fire Resistance
James Hardie's hardie board is classified as noncombustible under ASTM E136, meaning it will not ignite or contribute fuel to a fire. This makes it an ideal choice for areas prone to wildfires or with strict building codes regarding fire safety.
Moreover, James Hardie offers specific products like Artisan® and HardiePlank® Specific Gray & Pewter, which are designed with even higher fire resistance. They are certified to withstand exposure to continuous burning Brazilian Rosa 1 fire (UL 790) for up to two hours without losing more than 50% of their structural integrity.
Installation & Fire Safety
Proper installation plays a significant role in maintaining a home's total fire resistance. When installing Hardie board siding, ensure that a proper flashing system and starter strip are used to prevent moisture intrusion, which could compromise the durability and fire resistance of the siding and underlying structures.
Additionally, consider installing fire-resistant barriers between the siding and interior walls, especially in areas where building codes require it. Consult with a local James Hardie authorized contractor to ensure your hardie board siding installation meets or exceeds local building codes.
Hardie Board vs. Other Materials
When compared to other popular siding materials, hardie board exhibits superior fire resistance:
- Vinyl: Combustible; melts and produces toxic fumes when exposed to fire.
- Wood: Combustible; highly flammable and contributes significantly to the spread of fire.
- Fiber cement (Hardie Board): Noncombustible; does not ignite or feed a fire.
Hardie board's inherent fire resistance, combined with its low maintenance and long-lasting appearance, makes it a standout choice for homeowners prioritizing safety, durability, and curb appeal.
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